PDF malware analysis — malicious · 597fe823ba394038

MALICIOUS

PDF

102.1 KB Created: 2021-08-01 03:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: d26a2af7738a480773b124806dc9fb8a SHA-1: c8d1ef127c71be4029cd7e99190e9f0685431672 SHA-256: 597fe823ba394038b9f6838f24702674a32f0e5a07876c5bcf35dc94241acc93

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9534

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://asupuro.com/user_data/image//file/xukuzamabar.pdf In PDF document text
- https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0f6035595eb70f9dff24efafbfd24ad2/winuxiw.pdfIn PDF document text
- https://horticulturenepal.org/userfiles/file/83687321132.pdfIn PDF document text
- https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/sdu29amk4buioqeeui3hfsapn4/25499192164.pdfIn PDF document text
- https://thegioidongphuc.net/ckfinder/userfiles/files/disizugudoguxu.pdfIn PDF document text
- https://motelandratecuci.ro/userfiles/file/43946276341.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/89d3f6b9ec9a73065979d0047cd21e3f/79489092478.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7792213e---vasuxejogoxetetizemijoma.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085db0e05c8e---57041079655.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/48448996453.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160904af5d2e2d---81881319504.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285fb21c06---wisesexejeporuten.pdfIn PDF document text
- http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9de97c23---nogakilukoxewot.pdfIn PDF document text
- http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608639df68006---48036215125.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160841f53454db---bilonolek.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607310d0c6dcf---15691999438.pdfIn PDF document text
- http://iberia-ex.com/images/blog//file/gavubu.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rgrs6p30h8tcnvprphhcs17rl3/6524228179.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a48ac1ac---55565065291.pdfIn PDF document text
- https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7ce8c84356a6b583b2937d112add4567/novaxekovezunilegeruroze.pdfIn PDF document text
- https://bandai-k.com/userfiles/file/61934231519.pdfIn PDF document text
- http://constantemails.com/userfiles/file/1626957093sefimezoderotibuwubebunos.pdfIn PDF document text
- https://mmszke.hu/files/file/wedujiv.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nokpc384olnsor7qfmp4vu86mv/66086949744.pdfIn PDF document text
- http://manpukulivermore.com/uploads/files/28730546390.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091556a91474---93240313708.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/ziletobigofigonem.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+change+league+of+legends+voice+to+japanese+garenaPDF link annotation
- https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/04e433868728854e2db7ef49165ae4a6/dexarul.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f6c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6C6	24344 bytes
SHA-256: `f2a082b07381ded29b9c6dff67b59d3adbf86cf538c4db1666d83b6c7da660f6`
`font_01_sfnt_off0001314f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1314F	16192 bytes
SHA-256: `97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd`
`font_02_sfnt_off000146d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x146D2	3856 bytes
SHA-256: `e7d143a726468ef9fede0929a89dc3f31e530c54a30399c3c6273a52a740c723`
`font_03_sfnt_off00015521.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15521	11272 bytes
SHA-256: `252d5ac733e4147db05a886ecf280e079eff399302ebcb0966cade4a3b7172f8`
`font_04_sfnt_off00016f53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16F53	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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